AL XII line ratios in the sun

Details AL XII line ratios in the sun AL XII line ratios in the sun

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..109...31k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 109, no. 1, 1987, p. 31-35. SERC-supported research.

Physics

7

Electron Energy, Electron Impact, Electron Transitions, Emission Spectra, Excitation, Solar Flares, Electron Density (Concentration), Ground State, Line Spectra, Solar Activity, Solar Maximum Mission, X Ray Spectra

Scientific paper

Recent calculations of electron impact excitation rates in He-like Al XII are used to derive the theoretical electron temperature and density sensitive emission line ratios G(=(f + i)/r) and R(= f/i), where f,i, and r are the forbidden 1s2 1S-1s2s 3S, intercombination 1s2 1S-1s2p 3P and resonance 1s2 1S-1s2p 1P transitions, respectively. These ratios are found to be significantly different from earlier calculations, and are in much better agreement with X-ray spectral data for two solar flares obtained with the SMM and P78-1 satellites.

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